imx6: Add support for Toradex Apalis family of CoMs

This patch adds support for the following computer on modules (CoM) from
Toradex[A]:

 Apalis iMX6 Quad 2GB IT - i.MX 6Quad 800MHz, 2GB DDR3, 4GB eMMC
                                             -40° to +85° C Temp
 Apalis iMX6 Quad 1GB    - i.MX 6Quad 1GHz,   1GB DDR3, 4GB eMMC
                                               0° to +70° C Temp
 Apalis iMX6 Dual 1GB IT - i.MX 6Dual 800MHz, 1GB DDR3, 4GB eMMC
                                             -40° to +85° C Temp
 Apalis iMX6 Dual 512MB  - i.MX 6Dual 1GHz, 512MB DDR3, 4GB eMMC
                                               0° to +70° C Temp

I've developed and tested it on Quad 2GB IT v1.1A and Dual 512MB v1.1A
CoMs, using Ixora[B] carrier board v1.0A, but it should hopefuly work on
Eval[C] board as well.

A. https://www.toradex.com/computer-on-modules/apalis-arm-family/nxp-freescale-imx-6
B. https://www.toradex.com/products/carrier-board/ixora-carrier-board
C. https://www.toradex.com/products/carrier-board/apalis-evaluation-board

Flashing/recovery instructions:

 1. Download and compile imx_loader for OpenWrt from
    https://github.com/ynezz/imx_loader

 2. Enter recovery mode as desribed in
    https://developer.toradex.com/knowledge-base/imx-recovery-mode

 3. Connect board via USB to the host computer, check that it's connected
    by lsusb:

    15a2:0054 Freescale Semiconductor, Inc. i.MX 6Dual/6Quad SystemOnChip
              in RecoveryMode

 4. Copy following OpenWrt images to imx_loader directory:
         SPL
         u-boot.img
         u-boot-with-spl.imx
         openwrt-imx6-apalis-recovery.scr
         openwrt-imx6-apalis-squashfs.combined.bin

 5. Run imx_usb in imx_loader directory

Signed-off-by: Petr Štetiar <ynezz@true.cz>

2 files changed, 162 insertions, 0 deletions

diff --git a/target/linux/imx6/patches-4.19/301-apalis-ixora-dts-leds.patch b/target/linux/imx6/patches-4.19/301-apalis-ixora-dts-leds.patch
new file mode 100644
index 0000000000..acec1e8e3d
--- /dev/null
+++ b/target/linux/imx6/patches-4.19/301-apalis-ixora-dts-leds.patch
@@ -0,0 +1,86 @@
+arm: dts: apalis-ixora: Add status LEDs aliases
+
+Signed-off-by: Petr Štetiar <ynezz@true.cz>
+
+--- a/arch/arm/boot/dts/imx6q-apalis-ixora.dts
++++ b/arch/arm/boot/dts/imx6q-apalis-ixora.dts
+@@ -60,6 +60,10 @@
+ 		i2c2 = &i2c2;
+ 		rtc0 = &rtc_i2c;
+ 		rtc1 = &snvs_rtc;
++		led-boot = &led_boot;
++		led-failsafe = &led_failsafe;
++		led-running = &led_running;
++		led-upgrade = &led_upgrade;
+ 	};
+ 
+ 	gpio-keys {
+@@ -123,22 +127,22 @@
+ 		pinctrl-names = "default";
+ 		pinctrl-0 = <&pinctrl_leds_ixora>;
+ 
+-		led4-green {
++		led_running: led4-green {
+ 			label = "LED_4_GREEN";
+ 			gpios = <&gpio1 17 GPIO_ACTIVE_HIGH>;
+ 		};
+ 
+-		led4-red {
++		led_upgrade: led4-red {
+ 			label = "LED_4_RED";
+ 			gpios = <&gpio1 21 GPIO_ACTIVE_HIGH>;
+ 		};
+ 
+-		led5-green {
++		led_boot: led5-green {
+ 			label = "LED_5_GREEN";
+ 			gpios = <&gpio2 1 GPIO_ACTIVE_HIGH>;
+ 		};
+ 
+-		led5-red {
++		led_failsafe: led5-red {
+ 			label = "LED_5_RED";
+ 			gpios = <&gpio2 2 GPIO_ACTIVE_HIGH>;
+ 		};
+--- a/arch/arm/boot/dts/imx6q-apalis-ixora-v1.1.dts
++++ b/arch/arm/boot/dts/imx6q-apalis-ixora-v1.1.dts
+@@ -61,6 +61,10 @@
+ 		i2c2 = &i2c2;
+ 		rtc0 = &rtc_i2c;
+ 		rtc1 = &snvs_rtc;
++		led-boot = &led_boot;
++		led-failsafe = &led_failsafe;
++		led-running = &led_running;
++		led-upgrade = &led_upgrade;
+ 	};
+ 
+ 	gpio-keys {
+@@ -124,22 +128,22 @@
+ 		pinctrl-names = "default";
+ 		pinctrl-0 = <&pinctrl_leds_ixora>;
+ 
+-		led4-green {
++		led_running: led4-green {
+ 			label = "LED_4_GREEN";
+-			gpios = <&gpio1 14 GPIO_ACTIVE_HIGH>;
++			gpios = <&gpio1 17 GPIO_ACTIVE_HIGH>;
+ 		};
+ 
+-		led4-red {
++		led_upgrade: led4-red {
+ 			label = "LED_4_RED";
+-			gpios = <&gpio1 12 GPIO_ACTIVE_HIGH>;
++			gpios = <&gpio1 21 GPIO_ACTIVE_HIGH>;
+ 		};
+ 
+-		led5-green {
++		led_boot: led5-green {
+ 			label = "LED_5_GREEN";
+ 			gpios = <&gpio2 1 GPIO_ACTIVE_HIGH>;
+ 		};
+ 
+-		led5-red {
++		led_failsafe: led5-red {
+ 			label = "LED_5_RED";
+ 			gpios = <&gpio2 2 GPIO_ACTIVE_HIGH>;
+ 		};
diff --git a/target/linux/imx6/patches-4.19/302-apalis-ixora-dts-reset-button.patch b/target/linux/imx6/patches-4.19/302-apalis-ixora-dts-reset-button.patch
new file mode 100644
index 0000000000..ede872fb62
--- /dev/null
+++ b/target/linux/imx6/patches-4.19/302-apalis-ixora-dts-reset-button.patch
@@ -0,0 +1,76 @@
+arm: dts: apalis-ixora: Add switch3 as reset button
+
+Signed-off-by: Petr Štetiar <ynezz@true.cz>
+
+--- a/arch/arm/boot/dts/imx6q-apalis-ixora-v1.1.dts
++++ b/arch/arm/boot/dts/imx6q-apalis-ixora-v1.1.dts
+@@ -70,7 +70,7 @@
+ 	gpio-keys {
+ 		compatible = "gpio-keys";
+ 		pinctrl-names = "default";
+-		pinctrl-0 = <&pinctrl_gpio_keys>;
++		pinctrl-0 = <&pinctrl_gpio_keys &pinctrl_switch3_ixora>;
+ 
+ 		wakeup {
+ 			label = "Wake-Up";
+@@ -79,6 +79,13 @@
+ 			debounce-interval = <10>;
+ 			wakeup-source;
+ 		};
++
++		reset {
++			label = "reset";
++			gpios = <&gpio1 16 GPIO_ACTIVE_LOW>;
++			linux,code = <KEY_RESTART>;
++			debounce-interval = <10>;
++		};
+ 	};
+ 
+ 	lcd_display: display@di0 {
+@@ -292,4 +299,10 @@
+ 			MX6QDL_PAD_NANDF_D2__GPIO2_IO02 0x1b0b0
+ 		>;
+ 	};
++
++	pinctrl_switch3_ixora: switch3ixora {
++		fsl,pins = <
++			MX6QDL_PAD_SD1_DAT0__GPIO1_IO16 0x1b0b0
++		>;
++	};
+ };
+--- a/arch/arm/boot/dts/imx6q-apalis-ixora.dts
++++ b/arch/arm/boot/dts/imx6q-apalis-ixora.dts
+@@ -69,7 +69,7 @@
+ 	gpio-keys {
+ 		compatible = "gpio-keys";
+ 		pinctrl-names = "default";
+-		pinctrl-0 = <&pinctrl_gpio_keys>;
++		pinctrl-0 = <&pinctrl_gpio_keys &pinctrl_switch3_ixora>;
+ 
+ 		wakeup {
+ 			label = "Wake-Up";
+@@ -78,6 +78,13 @@
+ 			debounce-interval = <10>;
+ 			wakeup-source;
+ 		};
++
++		reset {
++			label = "reset";
++			gpios = <&gpio1 16 GPIO_ACTIVE_LOW>;
++			linux,code = <KEY_RESTART>;
++			debounce-interval = <10>;
++		};
+ 	};
+ 
+ 	lcd_display: display@di0 {
+@@ -293,4 +300,10 @@
+ 			MX6QDL_PAD_NANDF_D2__GPIO2_IO02 0x1b0b0
+ 		>;
+ 	};
++
++	pinctrl_switch3_ixora: switch3ixora {
++		fsl,pins = <
++			MX6QDL_PAD_SD1_DAT0__GPIO1_IO16 0x1b0b0
++		>;
++	};
+ };